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I'll be using mine (black anodize w/ SC) with this polished cover, so I'm hoping that the dimensions from the bottom edge of the cap to the latching slots are the same as stock cap. On second thought and after looking at the picture, I'm not really sure how this cap is attached because writing isn't straight. Is it threaded like the oil fill or slotted similar to radiator cap ?

It's identical to the original cap. I would say its slotted and not threaded. I'm not sure why yours is off, there's 3 tabs on the cap and tank but only one position on the tank has a stop to lock the cap in place.Possibly just needs to be clocked over another position.

Didnt get to work on the cap like i previously stated, I Sold off some door sill inventory and found a few blanks that needed engraving so I took care of that first. Got back on this yesterday. Finished the inside of the cap, rubber seal fits in nice and locks right on the tank, feels real good. I'll start cutting and engraving these over the next few days. I'll get a way to order these online going soon too.